#include<stdio.h>
void swap(int *x,int *y){
	int temp;
	temp=*x;
	*x=*y;
	*y=temp;
}
int main(){
	int x,y;
	x=100;
	y=200;
	printf("x=%d y=%d\n",x,y);
	swap(&x,&y);
	printf("x=%d y=%d",x,y);
	return 0;
} 
